Re: [PATCH v8 1/4] Acceptance tests: introduce BLD_DIR, SRC_DIR and LNK_DIR

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 12/19/19 12:24 AM, Cleber Rosa wrote:
> Some tests may benefit from using resources from a build directory.
> This introduces three variables that can help tests find resources in
> those directories.
> 
> First, a BLD_DIR is assumed to exist, given that the primary form of
> running the acceptance tests is from a build directory (which may or
> may not be the same as the source tree, that is, the SRC_DIR).

Can we name this BUILD_DIR?

This would be more in line with the other buildsys files (configure/make).

> If the directory containing the acceptance tests happens to be a link
> to a directory (kept as LNK_DIR), it's assumed to it points to the
> source tree (SRC_DIR), which is the behavior defined on the QEMU
> Makefiles.  If the directory containing the acceptance tests is not a
> link, then a in-tree build is assumed, and the BLD_DIR and SRC_DIR are
> the same and LNK_DIR is set None.

Similarly, can we name this CURRENT_DIR instead of LNK_DIR?

> 
> Signed-off-by: Cleber Rosa <crosa@redhat.com>
> ---
>   tests/acceptance/avocado_qemu/__init__.py | 27 ++++++++++++++++++-----
>   1 file changed, 21 insertions(+), 6 deletions(-)
> 
> diff --git a/tests/acceptance/avocado_qemu/__init__.py b/tests/acceptance/avocado_qemu/__init__.py
> index 6618ea67c1..ac7597f7fe 100644
> --- a/tests/acceptance/avocado_qemu/__init__.py
> +++ b/tests/acceptance/avocado_qemu/__init__.py
> @@ -16,8 +16,23 @@ import tempfile
>   
>   import avocado
>   
> -SRC_ROOT_DIR = os.path.join(os.path.dirname(__file__), '..', '..', '..')
> -sys.path.append(os.path.join(SRC_ROOT_DIR, 'python'))
> +#: The QEMU build root directory.  It may also be the source directory
> +#: if building from the source dir, but it's safer to use BLD_DIR for
> +#: that purpose.  Be aware that if this code is moved outside of a source
> +#: and build tree, it will not be accurate.
> +BLD_DIR = os.path.dirname(os.path.dirname(os.path.dirname(os.path.dirname(__file__))))
> +
> +if os.path.islink(os.path.dirname(os.path.dirname(__file__))):
> +    #: The link to the acceptance tests dir in the source code directory.  If
> +    #: build dir is the same as the source dir, this is set to None
> +    LNK_DIR = os.path.dirname(os.path.dirname(__file__))
> +    #: The QEMU root source directory
> +    SRC_DIR = os.path.dirname(os.path.dirname(os.readlink(LNK_DIR)))
> +else:
> +    LNK_DIR = None
> +    SRC_DIR = BLD_DIR
> +
> +sys.path.append(os.path.join(SRC_DIR, 'python'))
>   
>   from qemu.machine import QEMUMachine
>   
> @@ -49,10 +64,10 @@ def pick_default_qemu_bin(arch=None):
>       if is_readable_executable_file(qemu_bin_relative_path):
>           return qemu_bin_relative_path
>   
> -    qemu_bin_from_src_dir_path = os.path.join(SRC_ROOT_DIR,
> +    qemu_bin_from_bld_dir_path = os.path.join(BLD_DIR,
>                                                 qemu_bin_relative_path)
> -    if is_readable_executable_file(qemu_bin_from_src_dir_path):
> -        return qemu_bin_from_src_dir_path
> +    if is_readable_executable_file(qemu_bin_from_bld_dir_path):
> +        return qemu_bin_from_bld_dir_path
>   
>   
>   def wait_for_console_pattern(test, success_message, failure_message=None):
> @@ -122,7 +137,7 @@ class Test(avocado.Test):
>           self.qemu_bin = self.params.get('qemu_bin',
>                                           default=default_qemu_bin)
>           if self.qemu_bin is None:
> -            self.cancel("No QEMU binary defined or found in the source tree")
> +            self.cancel("No QEMU binary defined or found in the build tree")
>   
>       def _new_vm(self, *args):
>           vm = QEMUMachine(self.qemu_bin, sock_dir=tempfile.mkdtemp())
>